Furnace



(No Model.) I

M. FOSTER. 3 Sheets Sheet 1.

FURNACE! No. 401,546. Patented Apr. 16., 1889.

N. PETERS. Fhokrumograpbnr. wnshin inn. 04 c (No Model.)

3 SheetsSheet 2. M. A. FOSTER.

- FURNACE. No. 401,546. Patented Apr. 16, 1889.

Awe a? 1 .zzmmtoj M. A. FOSTER.

3 Sheets-Sheet 3.

FURNACE.

(No Model.)

N0. 401,546. Patented Apr. 16 1889.

I N PEIEni Flwwumn m he 'UNITED STATES MICHAEL A. FOSTER, OF QT. LOUIS, MISSOURI.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 401,546, dated April 16, 1889'.

Application filed December 8, 1888. Serial No. 292,999. (No model.)

To all whom it may concern.-

Be it known that 1, MICHAEL A. FOSTER, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Boilers and other Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

This invention is in some respects an improvement on the invention for which Letters Patent No. 310,194; were granted ine January 6, 1885, and in which a flue led from the front part of the ash-pit to the f urn ace-chamber, discharging the air from the ash-pit upon the top of the fire.

In my present invention there is a flue eX- tending from the ash-pit and extending upward in the front wall of the furnace between the feed-doors, branching out above the doors and extending along both sides of the boiler to the rear end. The flue has a number of discharge-nozzles through which the air is forced into the fire-chamber by a steam-jet centrally placed in each air-nozzle. The vertical part of the fiue passes through the grate-bearing bar and has adjustable support thereon.

Figure I is a transverse section of a boilerfurnace with the improvement applied thereto at line I I, Fig. II. Fig. II is a detail longitudinal section. on line II II, Fig. I. Fig. III is a detail section at III III, Fig. I. Fig. IV is an end view of the transverse flue. Fig. V is a detail section at V V, Fig. IV. Fig. VI isa detail perspective view showing part of the vertical flue and grate-bearing bar. Fig. VII is a reduced horizontal section at VII VII, Fig. I. Fig. VIII is ahorizontal section, also taken 011 the lines VII VII, Fig. I, but showin g a modification.

In the main the boiler-setting may be of a usual character. The front wall is seen as 1, having the fire-doors 2, through which coal is fed to the fire.

3 is the fire-chamber, and at the grate-bars.

5 is the front grate-bearing bar, whose body is shown with a width equal to the thickness of the front wall, 1, and which has a channel flange or lip, 6, on which rest the front ends of the grate-bars, the said ends being hooked at 7 to engage in the channel-flange, as seen in Fig. II. The body of the bearing-bar is built into the front wall, while the flange 6 extends beyond the inner face of the wall.

8 is the vertical part of an air-fiue, which is built into the front wall, and which has lateral branches 9 at top, extending through the front and side walls, 10, to the outside of the latter, where they have stoppers 11, which may be removed to give access to the line for cleaning, etc.

12 are side fines extending through the side walls to the rear end of the boiler-setting, where they have valves 13, by which their ends may be wholly or partly closed. The air enters the vertical flue 8 through its open lower end, 14, which communicates with the ashpit 15.

16 is a valve or damper by which the flue may be partly or wholly closed. The flue has brackets 17, whose feet 18 rest upon the grate bearing bar 5, so as to support the fine in proper relative altitude with the grate-bars and the boiler 19. The fine, with or without its branches 9, is cast in one piece. In setting boilers the distance between the grate-bars and the boiler varies in different cases, and as the flue has support on the grate-bearing bar it is requisite that the brackets should be adjustable, so as to properlyplace the branches 9 and other parts relatively to the boiler, and for this purpose the brackets are adjustably attached to the flue by screws 20, which pass through vertical slots 21. in the brackets and screw into the flue. A single bracket may be used in place of the two. The flue 8 passes through an aperture made in the front side of the bearing-bar.

22 is a steam-pipe, which is shown passing beneath the flange 6 of the bearing-bar 5 toa point in front of the fine, from whence it eX- tends through the front wall of the flue and upward through this flue to the branch fine 9, through which it extends in branches 23, that extend to near the end. of the branch fines 9, where they have removable caps, so that access maybe had to the interior of the branch pipes for the purpose of cleaning them.

From the vertical fine 8 and branches 9 extend nozzles 24, which pass through the part of the front wall between the fines and the fire-ch amber and discharge air into the chamber. From the vertical part of the steam-pipe 22 and its branches 23 extend steam-nozzles 25, which are axially placed in the air-nozzles 24, so as to form injectors, by which mingled steam and air are injected into the fire-chamber. The steam-pipe is governed by a valve, 26. The device is shown as applied to a boiler-furnace, but may be used for furnaces in general, the steam-pipe not being essential to it in its most simple form.

In the modification shown in Fig. VIII the steam-jets 27 are inserted in the ends of the branch flues 9, and the steam-pipe 22, with its branches, may be dispensed with, the steamjets causing a suction in the side flues, 12, and causing the air to enter at their rear ends and pass through the flues 9 and 8 and nozzles 24 into the fire-space. In this case the damper at the bottom of flue 8 is closed, so that no air enters at that point.

I claim as my invention- 1.' The air-flue 8, leading from the interior of the ash-pit up the front of the fire-chamber and having side branches, 9, and having nozzles discharging into the fire-chamber.

2. The grate-bearing bar having a flange for support of the ends of the grate-bars, an aperture for the passage of an air-flue reaching from the interior of the ash-pit in front of the fire-chamber and having nozzles discharging from the flue into the fire-chamber.

3. The combination, with a grate-bearing bar and an air-flue extending from beneath the fire in front of the fire-chamber and discharging therein, of brackets adjustably attached to the flue and resting on the bearingbar, substantially as and for the purpose set forth.

4. The air-flue opening beneath the fire within the ash-pit, extending upwardly in front of the fire-chamber and having nozzles discharging into the fire-chamber, and a steampipe having steam-nozzles Within the air-nozzles forming injectors, by which the air is mixed with the steam and injected into the fire-chamber, substantially as set forth.

5. The air-flue extending from beneath the fire and upward in front of the fire-chamber and having side branches, the upright pipe and branches having nozzles discharging into the fire-chamber. and a steam-pipe extending through said flue and its branches and having steam-nozzles within the said air-nozzles and forming with such nozzles injectors forcing air mixed with steam into the fire-chamher.

6. The combination, with a boiler-furnace, of the upright flue 8, branch flues 9, and longitudinal flues 12, with valves 13 and 16 to govern the airsupply, and discharge-nozzles extending from the flue to the fire-cha1nber, and a steam-pipe passing through the upright and branch pipes and having nozzles within the nozzles of the air-flues 8 and 9, substantially as and for the purpose set forth.

7. The combination, with the vertical airheating flue in the front of a fire-chan1ber having nozzles discharging into said chamher, and a port, 14, opening into the ash-pit, and a steam-pipe within said flue having steam-j et nozzles within the air-discharge nozzles, substantially as and for the purpose set forth.

8. The combination, with the furnace-wall, of a vertical flue in said wall having nozzles projecting through said wall into the furnace, a grate-bearing bar let into said wall and having an aperture for the passage of the flue and grooves or channels 6, and the grate-bars 4, having hooks resting in said groove, substantiallyas set forth.

MICHAEL A. FOSTER.

In presence of SAML. KNIGHT, GEO. H. KNIGHT. 

